Observation of the Θ+ Pentaquark at HERMES

Details Observation of the Θ+ Pentaquark at HERMES Observation of the Θ+ Pentaquark at HERMES

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005fuin.conf..180h&link_type=abstract

FUNDAMENTAL INTERACTIONS. Proceedings of the Nineteenth Lake Louise Winter Institute. Held 15-21 February 2004 in Lake Louise, A

Computer Science

Scientific paper

All hadrons that were observed until recently could be classified as either quark-antiquark states (mesons) or three-quark states (baryons). However, QCD permits also hadrons with manifestly more complex structures, such as exotics with a five-quark structure. The results of a search for the Θ+ pentaquark in quasi-real photoproduction on deuterium at the HERMES experiment are presented. The decay mode Θ + -> pK0s -> pπ +π - was studied through the measurement of the pK0s invariant mass spectrum. A |S| = 1 baryon state was observed as a peak in the invariant mass spectrum at 1528 ± 2.6(stat) ± 2.1(syst) MeV. The width is dominated by the experimental resolution.

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